package kr.hkit.powerjava.chapter22.collection; //565페이지 예제2

import java.util.HashMap;
import java.util.Map;

public class WordFreq {
	public static void main(String[] args) {
		Map<String, Integer> m = new HashMap<String, Integer>();
		
		String [] sample = {"to", "be", "or", "not", "to", "be", "is", "a", "problem" };
		
		for(String a :sample) {
			Integer freq = m.get(a);
			m.put(a, (freq == null)? 1 : freq+1); // ??
		}
		
		System.out.println(m.size() + "단어가 있습니다.");
		System.out.println(m.containsKey("to"));
		System.out.println(m.isEmpty());
		System.out.println(m);
		
	}
}
